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Smith Environmental Technologies Corporation <br />Quality Ass=ce/Quality Control Plan <br />Revised February 1995 <br />Ten percent of the water samples submitted to the laboratory for analysis will be duplicates. Water <br />sample duplicates will be created by filling two sample bottles from the well bailer. If more than one <br />bailer volume is required, each bailer volume will be split between containers. <br />4.0 SAMPLE PRESERVATION <br />Sample containers will be pre -cooled and transported to the site in the cooler. All samples will be <br />preserved as indicated on Table 1 and placed in a cooler immediately after collection. Chemical ice <br />sealed in plastic bags will be used in the cooler to cool and maintain samples at a temperature of 4°C. <br />A high -low thermometer will accompany the samples to document transport conditions. Further <br />discussion of sample preservation is included in the sampling protocols (Sections 11.0 and 12.0). <br />5.0 CHAIN -OF -CUSTODY PROCEDURES <br />5.1 Sample Labels <br />Each sample container will be labeled prior to filling to prevent misidentification. The label will <br />contain at least the following information: <br />✓ sample number which uniquely identifies the sample <br />Vol project title or number <br />✓ locution of sample collection <br />✓ soil boring or well number, as applicable <br />✓ name of collector <br />✓ date and time of collection <br />✓ type of analysis requested <br />5.2 Chain -of -Custody Record and Sample Analysis Request Form <br />A chain -of -custody record for each container or sample will be used to track possession of the <br />samples from the time they were collected in the field until the time they are analyzed in the <br />laboratory. <br />m:N-.Ashells\QAQC-95.wP5 <br />3 <br />• <br />SNftH <br />